Libav
timer.h
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1 /*
2  * Copyright (c) 2005 Luca Barbato <lu_zero@gentoo.org>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVUTIL_PPC_TIMER_H
22 #define AVUTIL_PPC_TIMER_H
23 
24 #include <stdint.h>
25 
26 #include "config.h"
27 
28 #if HAVE_INLINE_ASM_LABELS
29 
30 #define AV_READ_TIME read_time
31 
32 static inline uint64_t read_time(void)
33 {
34  uint32_t tbu, tbl, temp;
35 
36  /* from section 2.2.1 of the 32-bit PowerPC PEM */
37  __asm__ volatile(
38  "1:\n"
39  "mftbu %2\n"
40  "mftb %0\n"
41  "mftbu %1\n"
42  "cmpw %2,%1\n"
43  "bne 1b\n"
44  : "=r"(tbl), "=r"(tbu), "=r"(temp)
45  :
46  : "cc");
47 
48  return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
49 }
50 
51 #endif /* HAVE_INLINE_ASM_LABELS */
52 
53 #endif /* AVUTIL_PPC_TIMER_H */
static uint64_t read_time(void)
Definition: timer.h:28